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I updated an iPod Touch 3G and an iPad 1 to iOS 5.0.1 with no problems and no battery drain (before or after the update).

The basic premise in the article, "But unlike the iPhone, if the iPad screen turns off—either automatically or because the user pushes the wake/sleep button—it keeps its WiFi connection alive. The lower-level IP stack also remains active, as the iPad responds to ping packets", is NOT true...

Have you actually verified that this problem exists as described? I have attempted to confirm the DHCP leasing problem but have not been able to reproduce it (the iPad requests a new DHCP lease when awaking it from sleep after the lease has expired). I suspect that the problem may be more...