You should never compare the release of a game to its later EA-development. Sure, in the first weeks they updated pretty often but if you look an the content of this updates you see that this were mostly fixes for bugs and exploits. And of then also only the ones that were easiest to find were fixed at the beginning.
Now the team has shifted from fixing the easy stuff and the worst crashes to producing real new content(Rebellions, Keep battles, battle terrain system, ...). And this development take more time because you don't just change a few lines of code to fix some silly spawnpoints or something you have to create tonns of new code, scenes and so on.
Sure, they could still try a weekly update but then it would only annoy people because their Safegames get messed up all the time for perhaps 20 lines of patchnotes that include basicly nothing outside of one new helmet and two villages.
I will not say that TW ist very efficient with their updates, but it is logical that we will not see the same pace we saw a year ago.