The Washington Post has a new review of the Treo 600 at

There's not much new information, but this is interesting: "The [GSM] 600's internal lithium-ion battery lasted for four days of moderate use in one test, seven hours (!) of talk time in a second test. Handspring says the CDMA version will offer closer to four hours of talk time; on either model, a backup battery should preserve your data for four days after the main battery runs out."