In a new dev diary at the official LotRO website, Ken "Graalx2" Burd and Brian "Zombie Columbus" Aloiso spell out some of the upcoming tweaks. The good news is that the randomness associated with legendary items is soon to be a distant memory. In spite of the Pool A/Pool B legacies introduced with the Mirkwood expansion, players would still occasionally be stuck with item legacies that didn't fit with particular playstyles. New Legacy Replacement Scrolls will remedy this situation; they will be acquired through the deconstruction of an item with the desired legacy (or through the game's item shop).
The devs also have a bit of info to pass along regarding changes to the game's relic system. In a nutshell, the goal for relics was the same as the goal for legendary item tweaks: reduce the random element and give the player more control. To this end, the number of relic tiers has been reduced to six, as has the amount of time required to attain the top tier. Secondly, Turbine has added a new legendary item currency called shards, which serves to "bind various parts of the system together," according to Aloiso. It's a lot more complicated than that, of course, and you can read the lengthy details at the official LotRO website.