This isn't exactly true. The release schedule generally looks like this: first, an "early release" of basic (This isn't really a beta, but sometimes it isn't fully proofread and playtested.), a few (1-3) days later, the release of extended, followed another few (1-3) days later by the "general" release to lower tiers. Whether we get both here at the same time or not depends on the tier of whoever leaks it and whether both versions are available when it leaks. The extended version is currently available. Just nobody has leaked it yet.
For the record, if your bandwidth is at a premium and extended is slow to leak here, just download basic for this month and pick up extended next month or the month after. You're really not missing much, and none of it is "time sensitive" at all.
