I've just recently started on it, but have done a fair bit of forum trolling so i'll chime in first with my noob perspective...
1) What is the combat upgrade like? Is it any diffrent than what the old combat was like.
Although I obviously wasn't there previously, the CU is probably the first thing any SWG vet will tell you about when asked about the game. Its the reason a lot of them left, and the main reason why, is that it introduced Jedi.
The game is set, I beleive, between Episode's V and VI - during which time, Jedi were all but extinct... the introduction of Jedi as a profession obviously spawned a wave of people acquiring it. Jedi roaming all over the place despite their 'extinction' ruined the 'immersive experience' of a lot of people, and also created a lot more interest in the Bounty Hunter profession, which is, from what I gather, the best or the only way to track down and kill a Jedi.
To be honest, i've been playing for a week or so now, and i've only seen one Jedi. For me, the CU thing isn't an issue simply because I wasn't there before it came into place, and i'm not really a die-hard SWG fan, so the immersive experience problem isn't as big an issue to me as it would be to most people.
2) Since I know they do not do full Live Events like on MxO, then are there RP groups like my Syntax Player Live Event Team on some servers?
It depends... i'd say its pretty much the same as mXo in its balance of those who want to roleplay, and those who just want to run around shooting things...
However SWG gives you more tool to build on your roleplaying experiences. A small example is player-cities, where you can create guild halls, elect mayors etc, and really build the politics of your establishment... Theres also an outlet for you to pursue your roleplay path... a small example being reputation... if your character decides to slaughter a whole bunch of Tuskans.. then a few weeks down the line, if you bump into them, they will try and kick your *CENSORED*. Thats only a minute way in which your roleplay character is given a bit more authenticity, as your actions actually can and in most cases do have ongoing consequences.
But as for finding Roleplayers - theres actually a way to search the entire community in-game for anyone who has noted themselves as a roleplayer.
3) If you had one thing from SWG that you wanted in MxO and vice-versa, than what would it be?
This is a tricky one... there is so much to choose from... its the features that attract me to SWG so much, rather than playing it because i'm a fan of the movies.
I'd go with player housing and everything that comes with it.
Being able to scout planets, find a suitable spot, apply for planning permission, acquire housing deeds, build them up, expand your city and create your own guild halls, city halls, cantina's, restaurants, shuttleports etc etc etc, and then being able to actually own your own house, control who accesses it, install storage, decorate it... that is one thing I would love to see a form of in MxO... although I wouldn't say no to the bulk of SWGs features to be brought over, particularly vehicles and the way in which xp and levelling is controlled.