Sounds great overall. Can't say I'm surprised that Dragon Riding is such a hackneyed feature though, the game in general has a bunch of weak mechanics strung together by a brilliant world and exploration theme. Mounted combat sucks even with mods and riding around in the sky would quickly lose its novelty once you realize it removes the primary reason for playing. The Vampire Lord stuff in Dawnguard was also pretty gimmicky. I think they need to bring in some gameplay designers from other studios at some point, probably the only way can get some modern gameplay designs in without losing the RPG aspects entirely.
Looking forward to everything else, it sounds like a full on expansion! I hope the quests and themed guild stuff are well written.