Hunter6 said:

1999- STAR WARS EP I
2002- STAR WARS EP II
2005- STAR WARS EP III

2008-INDY 4
2011-INDY 5
2014-INDY 6 (more likely after INDY 6 comes out, Lucas will start talking about The new Star Wars Prelude Trilogy).

2015- Lucas more likely will start work on The new Star Wars Prelude Trilogy. 2015 will be the 10th Anniversary of Episode III.

2017- PREQUEL TO STAR WARS SAGA 0.1 (George Lucas will be 73) 2017 is oddly the same year as Star Wars' 40th Anniversary.
2020- PREQUEL TO STAR WARS SAGA 0.2 (George Lucas will be 76)
2023- PREQUEL TO STAR WARS SAGA 0.3 (George Lucas will be 79)

Fortunately the world ends in 2012... see, even the end of the world has its good points ;)