Morathras

Just to clarify, since we just got done doing this switch, you will not keep the gear you have on your inventory when switching maps.  Your character will retain their level, stats, learned engrams, etc., but any gear that you have in your inventory will vanish.  When you load into the new map, it will be as if you died and you have to spawn in at a new point.  Your dinos will also not follow you to the new map, unless you upload them to an obelisk and then download them again after the switch, and even this is bugged right now and your players will have to go through an extra step (file edit on their drives) so that their local Ark data shows up for transfer after the map switch.  It's very messy right now.
 
If you switch to a new map, decide you don't like it, and switch back, your buildings and such will be saved on the old map save file, but you will still lose the gear you had in your inventory.  Stuff you kept in storages on the old map should still be there when you revert back, but the only way to move dinos and items back and forth between a map switch is to have the players use the obelisks for transfer. 
 
There is a developer note on reddit right now that they are aware that they messed up with TheCenter becoming official and did not use the same local profile save data for them.  They intend to release a fix for this sometime this week, and in the notes they mention that ANY dinos or items left in the obelisk when this update occurs will be lost.  See link below.
 
http://ark.gamepedia.com/241.1