SysMom,
First off, I am sorry that vBPortal does not impress you all that much, it sure does impress me.. I mean when I get my hands on the final version you can bet I will have it modified out the wazooo.. but
It could be the style/templates he has one that looks just like vb's just with the added portal, and he has made one for himself that has tabs. We are working on developing alot more templates or styles just like what phpnuke has... so that will or should change your mind. Btw they are easy to create.. so you can make the site almost look like anything you want
vBPortal combines phpnukes abilities with vb abilities. So there will be only one login and password needed throughout the whole site. There is no second registering on anything, if that is what you are wondering about. The user tables have been combined and utilizid for this reason, cause no one wants to have to register twice just to use different features on the same site. Yah maybe if you are yahoo or something with email, and different things, but not here.
The existing Nuke 5.X addons, hacks, modules, etc.. just need a *little* bit of code manipulation and they will work just fine with vbportal. I don't know about the new limited css support, didn't that just come out in the latest version 5.2? 5.1 or whatever was the latest till here recently was what vbportal used to build with/on. So all the brand new addons will have to be looked at and everything. The css support will probably be intergrated as an addon for vbportal, cause I don't think anything else is being added just like vb was doing it.
Testing is going on to get out all of the bugs that can be found, and everything. So I can't give a date or anything as to when it will be ready for distribution, but I will tell you installing it to a fresh vb is done and seems to be error'less

The problem, well not for sure if it is a problem is installing over it, just like you would with a hack. For the most part it works, just has to be done correctly and pefectly so far. So as soon as that is all figured out and got the A'OK from a few people that have tried it and successfully got it done, then it will be released
I think everyone that is envolved or around vbportal is eager to get started with it, and start making their site up with styles and colors... but we all have to be patient. Right now it is being beta tested in the contributing members section, and we are just hoping that with the new verison of vb that just came out that it won't delay the vbportal
hope that helps, if you want to know more please stop by the site register and ask more questions there