Personally I missed the last year edition, it happened far-away in Canada (alternating locations, so everybody can attend once in a while is a LGM tradition), but now I am looking forward to meet old friends, colleagues and make new aquitances.
But I want to be actively involved, not only as a consumer, so I won't just watch the conference, but be part of the program, so I submitted, and it was accepted, a talk about Wiki Loves Monuments, the Wikipedia Free photography contest, which was the most important project I was involved in the past year - it will be a different thing, about usage and community work, in the middle of many software development talks.
I also had another idea for a talk submission - a panel about design in the FOSS world and design in the community - a debate about its possibility (design is a cathedral, FOSS is a bazaar), the traps and examples from the real world. But I was a coward: figured is a very controversial topic on which I may get very acid, chickened-out of this flamewar. But while still considering it, I pitched the idea to a friend and the panel will happen. With a different team and a completely different outcome. I may troll it from the audience :D
So long story short: come to LGM, it will be tons of fun.