The VS series games don’t really rely on a link system for basic bnb combos, instead preferring the general rule of thumb known as a magic series. Light -> Medium -> Heavy being a general(not always accurate) way of knowing how certain normals combo.
To put it in concrete terms: It’s very easy to do something like an overhead, into an :l::h:-> :s:, into an air series into hyper or something. The window for executing stuff at that level of play is much easier than SFIV. The timing on simple stuff like that is very lax in comparison to 1frame links. While the basics of the game start off very simple, if the comments from Seth Killian are any indication, the complexity of execution grows quickly as you discover the full extent of what each individual character/assisted combo/whatever can do.
If you are not planning on advancing to high level play of MvC3(using MvC2 as a benchmark) and just rely on the basic most combos at your disposal (which can be pretty damaging on their own), you will find it easier. If you plan on taking your game to the next level and finding all the nasty resets, possible infinites, and all that jazz that will be vital for competitive playing, you will probably find it harder. I’m by no means a pro player, but I have played fighting games for a very long time, and that’s the impression that I get from playing MvC2/SFIV/TvC and following MvC3 very closely since its announcement.
Whether this is actually good info or me talking out of my ass remains to be seen on the 15th and beyond.