I just got my E90 last week and needed a case for it to carry around on my belt, as it takes too much space for comfort in my pocket.
I searched and searched for usable info on this topic, but did not find much useful information (just a little). There were links to the new case from Nokia CP-285. But I only saw it as item for sale but no user info. Also I live in Hungary and non of the locale stores have it yet in stock here, so I was left with the option to order online from expansys.com . BTW incredibly fast delivery (next day), its usually 3-4 days, so I must have gotten lucky with DHL this time.
Anyway my door bell rang this afternoon with the dispatch guy and I rushed down stairs for my new case.
I believe that others that are on the look out for case for the phone might find this info useful, as there are non available regarding this item. And not just the info, but also pics. are lacking as all you can find is the same picture all over the web, with no picture of the back or with the E90 inside.
BTW the pictures of this case that you can find anywhere (including the Nokia.com) are false. I will show you why, not a big deal, but still...
This is the original (fake) Picture from Nokia!
And this is what it looks like actually. Notice the difference? (tip: hole in the clip)
So you have this (my) review as a heads up for anyone in the same shoes.
Review:
Let me (for the sake of the impatient, like me) start by stating that it is (to me) a disappointment. No, not the quality, which is superb grade-A polyurethane (what ever that is:con?). Were nice build and sew quality (straight line, etc.)
The First and to me most disappointing fact is that it has no option for belt clipping. The back as you can see in the pictures below is completely flat. Yes I know that Nokia doesn't state anywhere that it has a belt clip, but i didn't find any information to the contrary either. (the initial case designed by Nokia for the E90, CP-181 has a belt loop, so you can were it on a belt. But it has design flaws, I tried one yesterday, and it takes two strong hands to squeeze in/out the phone). So yes, maybe this was my bad, but I had no way to check. But now at least YOU KNOW THIS.

The second thing is the open/close mechanism. From the original pictures available on the net, including the one on Nokia's page, you would guess that it uses some sort of magnetic mechanism as there are no clips or any thing else visible. Well guess what. That picture is fake (all of them)!
As you can see from the pics. below. It uses a small ball-headed metal button on the lower side and the upper just has a hole cut in it, which you need to squeeze the ball into. Very stupid and unpractical idea. For one there is now way to close it with one had. Two, its very prone to wear and tier, plus probably with time (as it loosens up) it will not hold.
A magnetic clip would have done the job perfectly, but this is a very bad solution (they should fire the designer).




The rest of the review is on the way....











