If there was one thing I could wish for modded minecraft to have/change, it would be mojang to stop screwing over mod developers, whenever they update it separates the community, and then, mod developers have to do a complete overhaul most of the time which causes them to get discouraged/quit/stay on one version. I wish either we as a modding community stay on one version or they make it less destructive to update to newer versions of minecraft.
I remember in 1.2.5 we were there for a while and look at all the things we as a community achieved.
I appreciate the response on what has changed, I just wanted a quick update, to get an idea of what has changed, and in the future I plan to go and see what mods have updated, and read the change logs, last time I made the pack for 1.6.4, it took me weeks to get it working the way I wanted it to, and to get it stable, or as stable as it can be with 246 mods.
Anyways, I do plan to update at some point, but I also wish I had the knowledge to port mods from older versions to newer ones, but alas I do not and do not think I would ever be able to.