On memory-card-gate, it's my one real disappointment about Vita on the hardware/platform side. I thought for sure they'd throw at least a token amount of storage in the box. I don't know who made the decisions on that, but thematically it seems so out of step with everything else. Very regressive vs the PS3 stance too.
On a more positive note, though, I think the 3G stuff is very smart, and hopefully we'll see similar plans over here. Interesting that they're not even touching contracts in Japan...just (very accessible) prepaid cards. I could go months and months with the 4980 yen card, assuming it's a contiguous amount of time and I can switch it on and off as I please - and it doesn't expire within a set timeframe. If they had similar stuff here I'd undoubtedly get the 3G model.