Android launches occur all the time and Google's own hardware doesn't dominate the market. It's therefore less newsworthy.
As to your random accusation of bias? Let's check the historical record:
After launch, the newer Nexus 7 sold fewer than a million units a month: http://www.fool.com/investing/general/2013/11/11/why-isnt-googles-new-nexus-7-outselling-its-predec.aspx . The iPad Air sold more than five million units a month after its launch: http://www.wired.com/2014/04/apple-q2-earnings-2/
The BBC put both of the launches of the last two days on its front page (see https://web.archive.org/web/20141015182903/http://www.bbc.co.uk/news/ ).
The difference is that the launch that's likely to interest more than five times as many people got one of the picture boxes rather than just a single line, giving it much greater prominence.
I'd suggest this is because the BBC reports based on likely reader interest. It's pretty much given that the iPads will massively outsell the tiny subset of new Android devices that was announced yesterday.