Do you foresee any meaningful rules changes occurring for the 2016 primaries and what impact on the nomination process do you think they would have?I doubt that anything significant will happen with the formal rules. Republicans, I suspect, will follow up on tightening the link between votes and delegates, making them a bit more like the Democrats in that regard; this part of the process has always been a bit murky to me, so I don't want to predict much about how successful the change will be. And it's not likely to matter a whole lot to nomination outcomes, although if we do ever get a seriously close nomination fight, it certainly could matter how it's resolved.
Beyond that, the most important changes will probably be within the current rules. One is that there are always shifts in the calendar, and they may have some effect; that's more or less impossible to predict at this stage. I think Democrats especially will fight hard to retain their four early states (Iowa, New Hampshire, Nevada, South Carolina), but whether they'll be successful is hard to know. The other "change" of note is that it will be the second cycle run under the current (almost) anything goes campaign finance regime, and the first for the Democrats. How will that affect things? Hard to say! But it's safe to guess that the folks who do that stuff will have another round of innovative practices, assuming that there are still areas in the current law available to exploit. My guess is that it won't be a very big deal, but that's just a guess.
As always, while I do pay a fair amount of attention to these issues, all those interested in it should be reading Josh Putnam.