Here are some peoples mmr going into season 4. MMR + 1200 / 200 = S4 MMR.
Format is User, S4 MMR, Current S3 MMR
Paceboys, 1454, 1707
Tunabarrage, 1366, 1532
Choclategod, 1361, 1516
Jayfeather, 1313, 1426
Ronaldo, 1361, 1516
Silvuss, 1342, 1483
Pokemon,1576, 1952 (Perfect example of the bullshit reset, pokemon is going from high plat mmr to mid gold mmr... The higher rated, the harder the reset hits)
Dragosh, 1520, 1839
Aperson, couldnt get a mmr
Jolteon, 1284, 1369
Brickwolf, 1211, 1221 (a 10 mmr difference, you were very close to 1200 so little change)
Rosekill, 1176, 1152 (Your MMR was bad enough that it moved you UP 20 points :|)
Balloon, 1198, 1182 (Same as rose, you went up)
HERES A NICE COMPARISON
WildTurtle, #1 in NA, CURRENT ELO= 2339
SEASON 4 ELO= 1770
WTFFFFF
This list of players was at the top of my head at 3 am. If i forgot you, do it yourself.
You play 10 promotion games at the start of the season, NOT preseason. Preseason is the same, but you can raise/lower your mmr during preseason I THINK. NOT SURE ON THAT ONE.
Ratings
Bronze = Anything below 1200
Silver = 1200 - 1479 (I think, based off of 'qualified' MMR for gold 5 that i thought was low, and also based off of 70 mmr per division)
Gold = 1480 - 1749
Plat = 1750 - 2019
Diamond = 2020+
likely wrong, but close.
TL;DR S4 Reset is destroying a ton of mmr, like badly, challenger to low plat bad
EDIT: APPARENTLY THIS IS FOUND HUMOROUS TO THOSE WHO DONT PLAY LEAGUE OF LEGENDS. I FIND IT HUMOROUS THAT PEOPLE WHO DONT PLAY THE GAME STILL BOTHER READING THIS THREAD. HMM.