Lead designer Michael Backus has posted on the Star Wars: The Old Republic forums regarding the recent companion brouhaha. If you want to read the rationale behind BioWare’s decision to nerf the bejesus out of companions in a recent patch, Backus’ wall-o’-text is pretty thorough.
The TL;DR takeaway is that SWTOR’s companions will be buffed going forward. They won’t be as powerful as they were when the Fallen Empire expansion launched, but “the increase will be significant.” Check the full post below for the numbers and the aforementioned explanation.