Seasons 1-7 David Duchovny's Mulder and Gillian Anderson's Scully.
Season 8 Mulder only appears in half the episodes.
Season 9... no more Mulder.
No Mulder = No X-Files
So, series 4 coming out this november, then series 5 and 6 in May & November 2002, S7 & 8 in May/Nov 2003 with whatever is left then.
I guess I'll still buy Season 9 and anything else if I'm alive, even though there is no Duchovny. I even went to see that stupid comedy Zoolander 'cause he has a cool cameo in it, plays this paranoid conspiracy theorist, all dirty and unshaven in glasses, long hair looking "spooky"