It makes sense to ask current Select subscribers whether they are interested in a Select32 as development of 32 would have to take a chunk of time/money away from the current Select. Having a ballpark figure for the number of current subscribers wanting to switch to Select32 or add it in to their current sub allows some idea of how much funding may be available before looking outside the current Select 'fold.'
People with experience of Select can then more realistically know which of those features/improvements they would find useful and expect to see in Select32 and so it might enable development to be pitched towards what a majority would want.
I'd hope that this is just the start of the process of getting the show on the road. The message was only sent at 2140 last night and seeks to gauge the "real level of demand" and "features expected of it".
They state that "much of what was proposed for the Merlin project was not of general interest" suggesting they have worked through the Merlin list and now seek sensible suggestions.
As we still have Risc PCs here, I'd be in the (b) add-in group.