The devs also elaborated on the much-debated level sync feature: “We have added a new system to the game called level sync. What this system will do is that when you are on a planet, but above the target level of that planet, your level will automatically be lowered to that planet’s level. However, while under level sync we will not take away any abilities or passive effects that you have. Also, while under level sync you will earn scaled experience. This enables a player to go play any of the content in The Old Republic and get rewarded appropriately for their time investment.”
Source: SWTOR. Thanks to Bob for the tip!