Nothing really factual is available so far.
1. 87 fatalities, no survivors,
2. aircraft damaged the rail line (about 50 meters of rail, railroad section closed for repairs)
3. Aircraft type reported 737-500
4. News reports aircraft was in for emergency landing when it crashed. The report states it like an emergency has already been declared, but I do not see any sort of confirmation for this.
5,. Probably based on eyewitness accounts, reports are that aircraft was on fire and broke-up in mid air.
6. Raido contact lost at 03:10 MSK at altitude of 1800 meters.
7. Black box (at least one) is reported found.
In case someone would need this, hotline phone +7 342 2949848 (in Russian probably)
For images check here
NEWSru.com :: Фото :: Boeing-737-500 упал на Пермь, in the top line green arrows are clickable (for those who do not read Russian)