WRT multiple IPs, I am interested to see how they interact with the mods ecosystem over time. Not so much can they make a twitter app or a 2-d platformer or something equally unrelated. I don't want a blocky minecraft looking pacman clone, at all.
I'd pay more for the RailCraft mod than I paid for minecraft itself, in terms of enjoyment per $. Of course the RC mod is free ... Also I use buildcraft mod although the gold pipes suck for steam distribution, and I'd pay for buildcraft, although thats free. Thermal expansion has better steam distribution...
The great mothership recently released a new minecraft version, which amounted to a couple new flowers and some biomes for people who don't mine, and nothing at all for anyone who does anything below the surface. Its called Minecraft, gentlemen, not fuzzy bunny craft so lose the giant mushroom biome please, and beg borrow or steal the buildcraft, railcraft, forestry, applied energetics, universal electricity, and a couple other mods so people who mine in MINEcraft actually have something fun to do rather than admiring double height grass blocks and mesa biomes.
The other thing which is hilarious from a guy who's been into computers since 1981 is the mods ecosystem is from a software engineering / systems administration standpoint just a tiny bit more advanced than the msdos era, actually pretty close to my historical digging into MVS/360. So its 2013 and apt and dpkg and friends have existed since the very early 90s, but in 2013 the way you handle version dependence and bug tracking and distribution is you manually visit adware download spam sites and click 50 times to download a tiny mod, and then track version compatibility manually by visiting 50 decentralized web forums. Oh and don't get me started on people who think a 15 minute youtube video with awful video and music counts as the only form of "documentation" required. Dudes, its 2013 almost 2014 not the era of msdos 3.11 and warez BBS systems? It really does suck after using Linux since the early 90s and downshifting back to 1985, even though I run minecraft on linux (both client and server).
Mojang should implement a minecraft mod store with a payment system thats trustworthy/reliable and very fast with excellent versioning compatibility. I'd pay $40 for railcraft and mojang can keep $10 of it and everyone else will be happy as long as I get $40 of actual service, like its very fast and completely transparent and highly reliable and effective and perhaps dare I ask, effectively and centrally documented and centrally bug tracked?