I am in two minds about these mk2 series.
They will drop mk1 series prices, low enough that some people that could never afford them before, will be able to afford them today, or even more so, in a couple of months...I might snatch a cheap OT mk1 as well, if its cheap enough, which I suspect it will be.
On the other hand, there is not nearly enough to make me think of upgrading.
Sampling through a cheap ADC is not something I look forward in doing, especially since I have some good AD in he studio already. I prefer to sample through that and transfer whatever it is to the Rytm via C6...I mean I do use the Rytm to play back samples but its not its primary use.
As for CV ins, very nice additions, but then again I find there is enough modulation in the machines as they are and besides I have 30U of eurorack to play with CV/Gate, so basically I turn to the Elektrons for the more "fixed" (for lack of a better word) to create the base for the modular to do its thing over the top.
The individual outs of the A4 is the biggest +, I don't care about the extra bass, I got pre amps (including Heat) to put the A4 through and EQs and its not like there is no bass there to boost in the first place.
All in all I find the AR/A4mk2 (especially A4) to be a more "honest" bearer of the mk2, adjective, with regards to the OT mk2 of course. But I won't upgrade either cause its not enough there to justify the insane amounts of money it will require...+ I have a thing for looks and mk1s look much better.
Also, what I have talked about wih friends that are also making tunes, is becoming true, Elektron is increasingly becoming like Apple...for better or for worse.