I've never heard them called that, but there are lots of competing (read from different providers) ways to do "AGPS". Off the top of my head:

LTO (long time orbit or somesuch) which provides very accurate ephemerides (i.e. more accurate than the ones you'd download from the sats) so that you can then go without updates for something like 6 weeks with reasonable accuracy. This is called lots of things and is offered by a number of providers.

There's our basic AGPS (i.e. in the N810) which is probably just the delivery of almanac + standard ephermerides.

There's also services which will take partial signals from the chipset and then brute-force them to work out where the chipset had to be to receive such a signal (i.e. offloading the processing for poor signals).

Probably more than that too!

And the answer is we don't know. Ask Nokia. And say please, as I'd quite like a Sirf Star III chipset in the next device

Please also post some links to your comparison research on the chipset powers and costs.