Limitations of the Q2686H with the 7.3 firmware?

There seem to be limitations in using the Q2686H with firmware 7.3?

I got a mailing from my distributor that i should switch to the Q2686G because the memory usage of the newest firmware is larger than the Q2686H can handle.
Possible problems seem to arise when using IDS, but i would like to know if there are other features affected as well?
(i’ve been using 7.x firmwares with my Q2686H for a while already, but encountered no problems with memory usage yet)