Using 4.1.2 on my GNex now (RasbeanJelly ROM + Trinity Kernel). This seems to be super fast, loving it. I don't know whether this experience is due to CM10 to RasbeanJelly or 4.1.1 to 4.1.2 but overall my experience on 4.1.2 has been absolutely superb. Performance seems to have improved.
On 4.1.1 I used to multi-touch notifications (which are enabled for expansion) to expand them. An SMS, email notification could be expanded.Haven't tried it on 4.1.2 yet. As I have just flashed a new kernel, I'm giving my phone a full charge with the phone being off, so once it gets fully charged I'll boot it up and try them.