After watching the trailer 10 times, and pausing frequently ( and avoiding finishing my applications for Graduate School) I have come to interesting observations.
[Edit>Some of this (like the non-magical 10 rings piece) has already been elaborated by Kevin Feige but I feel there is more to speculate.
1) I do not think SBK is the voice after the half way mark of the trailer (the "teacher"). I believe that the voice is Guy Pearce (and I could further that by saying that perhaps his voice is augmented by a "suit"). Can someone confirm this with any fact because I have seen a lot of web circulations that this is SBK's voice but don't know where it was actually sourced from.
2) At the 1:00 mark you see the 10 rings up close. I believe these are represented in a mixture of Arabic Numerals and possibly other derivations of eastern numerals. http://en.wikipedia.org/wiki/Arabic_numerals. This shot of SBK as Mandarin shows him with the 10 rings on (but no gems). I would wager that it's still remains true that he may not possess it's Makluan powers like the comics as it may confuse viewers with the infinity gems (http://marvel.wikia.com/Mandarin's_Rings). However, in the shot where he cocks his handgun he is not wearing the rings so don't know if there is a significance. I do believe he will be very non "magical" as Kevin Feige stated.
3) The scene with the child walking to a vigil with scorch marks on the walls (of people) may be either (a)post NYC Invasion scene or (b) flashback of the villain. I believe it's (a) considering all the flowers left for different scorch marks.
4) At the 00:52 mark you see someone in the rubble post an "attack" or explosion. This seems to be Happy Hogan on the ground bloodied, and this could be his death scene which would tie to the whole plot synopsis of Mandarin attacking Tony's "world."
5) At the 1:01 mark you see the Iron Patriot crashing someone on the table. This doesn't seem very Rhodie Like so it's safe to assume this is someone else but I may be wrong. Wouldn't make sense for it to be Eldrich Killian's character but that would tie into #1.
Copywrite Marvel 2012 for the Web sourced Image used as the Teaser graphic
http://marvel.wikia.com/File:RingsoftheMandarin.jpg
Credit to the following resources used in building this analysis: http://marvel.com/news/story/19592/first_iron_man_3_trailer
http://screenrant.com/iron-man-3-trailer-discussion-video-amc/