it is getting more complicated to me ... I am still waiting for a mobile friendly admin panel , or even a mobile apps for it
You don't have to type .php at the end of most urls for xenforo's mod friendly rewrites. For instance, if you go to blogs, the home page or forums of my site, .php is not at the end of any of them due to my .htaccess mod friendly rewrite settings that are enabled in Xenforo AdminCP. You can only do that with one URL in vBulletin 4.
4.2 actually got me hyped simply because of navigation manager. Something that can be modified easily in other softwares here is welcomed as groundbreaking feature, haha. Well, still it's nice to see it and I hope they push vBulletin 4 far. I hope they finish it, regardless of vBulletin 5 coming. There's a huge amount of features it could use. It deserves to be fully and properly developed.
I actually like the admincp, I must be the only old fart that appreciates a good use of iframe. I'll admit to a newbie it's daunting at first...that huge list of links on the left. But once you know where everything is you can be in and out of the vB admincp really fast. I don't find myself hunting for rarely used options as often as I do in IPB or Xenforo's admincps. It is good to see continued support for vBulletin 4.x simply because it provides an up to date option for those that choose to stick to the 3.x line. There are A LOT of forums out there running that code base, and lately I'm seeing more and more large forums make the move over to 4.x. I don't know if they'll be as willing to go to 5.x if they are running highly customized forums, some of these sites have spent a lot of man hours and money to build around the existing vBulletin code. 5.x will be the largest change to vBulletin ever if what I've heard about it is true. The jumps from 1.x -> 2.x -> 3.0.x were pretty major don't get me wrong, but the style of the under lying code remained mostly the same. 3.5.x was just an add-on system tacked onto 3.0.x, and 4.x is an extension of all that with more on top. 5.x isn't going to be a an improvement on prior versions, it'll be closer to xenforo in the underlying code. More "modern" practices used from the bottom up and take advantage of all the new fun things on the client's side that were not possible a decade ago when vBulletin was originally designed. The single biggest change is it'll be the first version that was produced 100% in house at IB. It's their chance to shine if they get it right.