At this point I'm starting to get a bit worried about wiim.
I can imagine the ultra being their main focus, and the secondary product being something much less.
Imagine working at wiim, being exited about your new products, and then seeing this forum with people guessing about new amplifier.
Considering some people's reactions to the ultra, it's connections, the screen, and it's guesstimate price, I could see a lot of negative reactions if the secondary product isn't what they themselves wanted.
For example, imagine if it's a new remote, with more buttons and a better mic for room correction.
While it's a great product that quite a few people would love, it's not exactly at the top of their wishlist.
I take your point, but I disagree.
WiiM are new to the game. They still have a relatively small number of products on their books, but with the possibility of a whole lot more to come.
Contained within their current products they already have the technology for a streamer, a DAC, an EQ/room correction system, and an amplifier, which can be released either as a standalone, individual product, or in conjunction with one or more of the others.
When they released the Mini, they'd only had to work on the streamer. *
When they released the Pro they'd only had to work on maxing out the stream's capabilities.*
When they released the Pro Plus they'd only had to work on the DAC.*
When they released the Amp, they'd only had to work on the amplification stage.*
* At each stage of the above they've gradually increased EQ capabilities, from GE to PEQ, from 4-band to 10-band, from stereo out to stereo + sub out, and adding room correction, and so on.
So by the release of the Ultra, they already have a great streamer, great DAC, great EQ (etc.), and a good-ish amp - the latter is the portion they've yet to perfect (I'm assuming room correction is finished by the time the Ultra goes on sale). And perfecting the amp/adding PFFB, they've got pretty much everything nailed.
They can then start launching variations on a theme, without too much work. Standalone amps. Pro Pluses with sub out. Ultra Max Amp (like the Ultra, but with a finished amp stage, better than the Amp's amp). Standalone EQ box. Ultra with balanced ins and outs.
Presuming they've been working on, and finished bringing PFFB to their amplification capabilities (apparently they just couldn't get it finished in time for the WiiM Amp's launch), there are a dozen new products they could release with fairly minimal R&D compared to what's gone before. Because they've got all of the above nailed already.
I don't think that the developers won't be reading the comments here and worrying. I think they'll be reading them and licking their lips!