Yep, OS6 is in development, and should be going golden master sometime in June. However, that date may end up getting adjusted, seeing as how the lead developer recently quit.
I refuse to pay that kind of money for an expansion card. I paid $0.33 US/MB for my Microdrive approaching a year and a half ago, so I'm not going to pay $0.64 US/MB now for a MemStick. It just doesn't make sense.
Using your wireless phone for wireless data is a workable solution, but unless you happen to have one of those rare, coveted unlimited use plans, the amount of data you can transfer is severely limited. Next, unless you have Bluetooth, you will need either a data cable or an IR connection in order to move data. Both tend to crimp my style, because they both preclude the simultaneous use of a keyboard by occupying the circuitry otherwise devoted to that purpose. IR, in addition requires line of sight, an inconvenience that I have come to know all too well. Finally, the connection will be anywhere from slow to unbearable. If you're trying to get any sizable data, then you will have problems there, too.
As for Wi-Fi, it's coming. For what it's worth, there aren't any Wi-Fi hotspots in the local airport or any of the Starbucks where I live. I'm also not lucky enough to live near one of the three or four McDonalds locations that have Wi-Fi access free with an Extra Value Meal
I just happen to go to a university that has a few Wi-Fi AP's scattered about.
Scott