Stock Marauders and Warhammers might run hot, but being 4/6 75 and 70 tonners, respectively, we'll be able to make some seriously badass custom designs.Sadly the computer game as it currently is set up will mean mechs like the Marauder and Warhammer might be nice to look at, but will not do very well in game as stock mechs since PPC's run so hot (along with large lasers). The P-Hawk will likely be a welcome addition to the ranks of mediums however because a 45 ton 6 mover can do some interesting things.
More mechs give more variety however, so I look forward to seeing them hopefully if HG can finally get put in the place legally it should have been put in a long time ago.
I suspect I'd end up playing the Phoenix Hawk like a more heavily armed and armoured Firestarter, which is already an absolute monster of a 'Mech, so I see nothing but good things there.