The most interesting part of the official blog post on the new adapter is the line "it is NOT designed for use with other remote controls". OK - so what in particular makes it unsuitable?
Assuming that the commands for this device are stored under Game System (with DVD) -> Sony -> PlayStation 3, then it would appear that this caution is due to the adapter using a custom codeset. Unlike all other PS3 control solutions, it does not use the standard Sony DVD+PS2 codeset, which is probably a good idea since it's likely that a lot of Harmony users may already have a Sony DVD player. It appears to use a protocol known as "pid-0066".
Of course with other adapters, they'd merely give you the codes in a file - however Logitech is in the business of selling Harmony accessories to Harmony owners, so they're not likely to go out of their way to make it easy to use with competing universal remotes.
But if you have a computer programmable remote, then I've already gone to the trouble of sorting out the new codes and have uploaded both decoded results, Pronto hex and a Pronto CCF for your PS3'ing enjoyment.
Download the file here [Link: files.remotecentral.com]