Date of Next Expansion?

[kadaan]

Some historical dates on expansions:

BC announced - October 05
1.11 - June 06 (Naxx, last classic content patch)
BC released - January 07 (+7 months, 15 months since announcement)
2.1 - May 07 (+4 months)
Wrath announced - August 07
2.2 - September 07 (+4 months)
2.3 - November 07 (+2 months)
2.4 - March 08 (+4 months)
Wrath released - October 08 (+7 months, 14 months since announcement)
3.1 was April 09 (+6 months)
3.2 was August 09 (+4 months)

Observations:
- Content patches look like they're generally around 4 months apart
- Both expansions came out 7 months after the last content patch
- Expansions came out 14/15 months after their announcement


From this, my guess are:
- 3.3 will come out in December or January (4 or 5 months after 3.2)
- 4.0 will come out 14-15 months after Blizzcon (August 09 -> October/November 2010)
- There will be a 3.4 content patch with something in it around April (3-4 months after 3.3, 6-7 months before 4.0)