Is there a new Tiagra groupset on the way?

I've been toying with the idea of  updating my commuter from Tiagra 4600 to 105 5800 or even R7000, but there seems to be a general shortage of components at the mo.

Decided to just clean and lube the r/h shifter to see if that improves the slight laziness it has developed. Suspect I will upgrade to 11 speed by summer anyway... 

Can't see Tiagra being changed til at least next spring, so at least another year but you never really know. Frankly it doesn't need any changes IMHO, there's nothing wrong with the front nor rear mechs which work with 5800/6800/9000/9001 STIs IIRC.

The one worry for us normal cyclists - i.e. non racers, tourists and the rest that don't want to be pushed to having dinner plate cassettes, is that Shimano will discontinue the triple at that level and leave it at Sora. In fact the current Tiagra triple chainset is a bag of shite anyway, continuing on with their awful 50/39/30 which is just crap and has always been inferior to a 50/36/26. But then with its copy design of the higher level 4 arm type you simply can't go lower than a 30T ring which makes it just pointless really because then you need to go with a bigger cassette to get the low down gear which is what you want to avoid anyway so you might as well get a sub-compact double and stick with the dinner plate anyways. 

Shimano have certainly wanted to narrow their production line down and given next to zero thought to tourists/older and less capable riders who like what a triple offers with a reasonably narrow range cassette.

If you look at prices for left over NOS of 105/Ultegra triple STIs from the later 10 speed they have shot up massively because that's all there's going to be at that level since Shimano fucked us over. I've just bought two pairs of Tiagra Triple STIs as they do have a better design than the previous 105/Ultegra (though I love my 6700 set up on the audax/tourer) but going to run them with Sugino cranks and TA rings.

Oh and those groupset prices were only because you got offered a short cage RD and an 11-25 cassette so the prices were a bit false as most people would be wanting to replace the casette and need to get the longer cage RD. Again this was a backwards step from the 6700 10 speed as this did 32T on the SS variant.

4700 is fantastic - I think if it is refreshed it will be just be the FD redesign and maybe the same chainring change to better accommodate disc brakes.

Doubt you'll be able to get your hands on it in time for this winter.

I run 4700 on both bikes because I've got three sets of 10-speed only wheels, plus it's slightly cheaper, particularly when buying unused kit off eBay. Always plenty of that about as people buy a Tiagra-equipped frame and transfer their higher-end groups across.

I don't know for sure, but I'd bet money on it. Shimano seem to follow a predictable release schedule. Dura Ace > Ultegra > 105 > Tiagra > Sora, with a year gap between each. That pattern has held true for the last two generations or so and we had new 105 last year.

I’ve owned 4600 and 4700. 4700 is much nicer in my option. The hood shape is better and the under bar routing caused me no problems and looks much cleaner. It's also significantly better for lights and GPS on an out front mount as it doesn't get in the way. Front shifting is miles better, but rear shifting is about the same. Can’t comment on the brakes as I used non-series long drop brakes with both.

On some complete bikes the cost saving between Tiagra and 105 can be significant, but as the previous poster said, that shrinks a lot if buying aftermarket. I wouldn’t personally buy into 10 speed now unless I had a significant collections of 10 speed only wheels I needed to keep using. You may be aware, but Shimano changed the cable pull between 4600 and 4700 (4700 uses the same ratio as the new 11 speed), so there’s no compatibility between old and new shifters and derailleurs, you’d have to update them together. You could use your old cranks, chain, and cassettes if they aren’t worn out and you wanted to. Depending on what Shimano do with the new Tiagra, you might find 4700, while decent in its own right, ends up being a dead end, with little forwards or backwards compatability.

Not heard anything but Merlin have a full R7000 105 groupset at a shade under £400, which isn't that much more than the 4700 was selling at before everyone went out of stock.