There have been talk about new mega servers in SWTOR for a while, and with 4.3 PTS Patch Notes, the forum went wild. Eric Musco was quick to dispel the megaservers rumors though: Check it out:

Megaservers | 02.25.2016, 09:56 PM

Quote: Originally Posted by Joesixxpack They’re coming.

http://www.swtor.com/community/showthread.php?t=873570

Hey folks,

By the term “Megaservers” I presume you think we are collapsing multiple servers together into “megaservers.” Especially with many of the quality of life features you highlighted. These changes were only designed to allow friends to play together, regardless of their personal playstyle. Now someone who wants to play on a PvP server can play on the same server as their friends who don’t want to.

Hope that clears up any confusion.

-eric