No prototype yet, no bugs yet, no solutions yet. Standby power consumption even for GTA04 is still under evaluation and evolution. Since the current distros all follow a suspend-to-RAM scheme, it's pretty hard to evaluate how maemo (which never suspends to RAM but simply stops clocks) will perform, but we expect the results to be similar to N900 since OS and hardware both are almost identical to N900. After all that's one of the reasons to port fremantle to GTA04(-NeoN).
To spill the beans a bit, I'm a little concerned about USB used to do data to modem, since OMAP (resp usb core) is not exactly known verified good at power consumption. Thus we will have to have a close look to that detail during our pending evaluation phase of next few weeks, before we can do any kind of feature freeze for the hw.
/j