I know we just got our printers but I was thinking that it may be a good idea to start a thread for us to communicate our wish lists.
My contribution is:
I'd love to see a longer Y axis. I suspect going longer in the X axis becomes problematic unless they beef up the construction but making a longer Y axis should be much easier. It would really be nice if this was an addon for our existing printers. As far as length and since it is just a wish list, how about 280mm or just round it up to an even 300mm. :-)