Guild Wars 2

Hi,

first of all thanks for this amazing game, I’m having so much fun!
I might be in a unique case since I need to play on a different world than my main guild (I live in the USA and my guildies are in the EU), and plan on using guesting to play with them when I can. I have switched for now to their server to be able to play with them without guesting, but would like to switch back to a USA server before it stops being free. I am also aware that guesting is coming, but no ETA yet.

My questions are these:
- When will server transfers stop being free, and will that coincide more or less with guesting being available?
- Will you warn us when server transfers will start costing gems?

Thanks