I was trying to find it myself. But what my brother has found that the new flat head xp or lt or whatever it is called is only .2 joules better than the prior models zeagle flat head not the 6. the both have the same conical design in the 1st stage and annual service kit for the flathead 7 is the same as the 6's, etc. I in fact, bought my flat head 6 for 590 from scubatoys some months ago for 590.00 so buying a flathead 6 right now is a great idea. Thinking about the flat head 7 looks like I won't be buying this one anytime soon. My flat head 6 does more than I really need, already.
as for the 2nd stage the exhaust tee, does not show at all when looking at it in the front view, miflex hose is used as a standard. Other than that, that is the only thing I can see that has changed on the 2nd stage.