LFR lets you see all the raids now. Probably the biggest difference.
Pretty much.
But it depends on what your definition of "solo" is. Do you mean strictly activities to do on your own, or what? Because LFR is certainly made for solo people who don't want to do real raiding since it's very forgiving and you que for it LFD style, but, it is still a group activity in that you are playing with 24 other people.
That said, even if it is just content you can do purely on your own MoP has gone a long way of adding stuff to do. There isn't some big end all be all solo progression or anything, but, 90% of their "ways to make people go out into the world" has revolved around solo stuff. It's been things like special treasures hidden around the world you can find (all of which have useful or fun uses), the rare spawns in each zones that are fun to fight/drop unique items, archaeology improvements like getting pristine artifacts to put on display in your own mini-museum, the brawler's guild which is an area where you fight challenging solo bosses (granted for this one you still need at least LFR level gear to get past the later fights), pet battles, and so on. Mists has been all about adding little things to the game to diversify what you spend your time doing if you so choose to.
The daily quest and rep system is still there but it's been changed pretty differently from how it has worked in the past. There are no more tabards to just grind dungeons for rep, but, at the same time most of what you get from reps is vanity items. Only 4 of the original reps added in Mists has usable gear, but, at this point in the expansion if you don't want to do dailies it can all be 99% ignored and moving forward Blizzard has made it a goal to make any gear you get from max level quests fairly worse than what you will find in even just LFR. Also pretty much every one of the hubs is all about fast quests, there is really only 1 hub in MoP that is on the level of stuff like Hodir or the Argent Tourney in wrath that was fairly time consuming to finish all their quests.