Treo central has posted an article from briefings/conversations addressing things like wi-fi, the (lack of a) 1.3mp camera, sprint disabling DUN, is the 650 going to break as often as the 600, etc.

http://www.treocentral.com/content/Stories/479-1.htm

An excerpt:

Q: No WiFi? Are you Crazy?

A: palmOne may seem crazy for not having a WiFi solution available, but at least they now seem more open to the idea then previously. During the press conference, the first question to Ed Colligan was why they did not built WiFi in. He replied: "We put things in that we think that are absolutley critical to the device".

When pushed for information about adding WiFi later, he added "We do have a wifi card that will work in the SD slot, but we do not have the drivers yet." Colligan continued to say that palmOne will be working on creating the necessary drivers.

This is opposite of what Greg Shirai told us in the pre-briefing conference call earlier this weekend. Shirai said that palmOne will not support a WiFi card for the Treo 650, as it was more complicated than drivers alone. Along with staff from mytreo.net and InfoSync World, we asked Colligan about this discrepancy.
...