Buried in the Palm Centro user guides this picture has prompted rumors that the smartphone company is planning further color releases of their budget handset.  While the white model with green keys is the AT&T version (as we reviewed last week), the black version next to it is available SIM-free in Europe and the red could be Sprint’s CDMA model, the white with grey number pad and blue handsets are as-yet unannounced.

It’s uncertain whether the two new handsets (and possibly a GSM version of the red Centro) will be available SIM-free, although the “AT&T only” legend beneath the green-keyed smartphone might indicate that. 

[via Gadgetell]