It seems the celebrations were a bit premature, as far as I know Alpha 1.5, although officially certified 24 hours ago, is still not available for download anywhere. So maybe my original estimate of Friday will turn out correct. I haven’t heard anything from Microsoft since the email, and there are rumours on the internet of some sort of delays in the HQ as found by Omega Ra here http://www.wpcentral.com/marketplace-updates-late-two-weeks-row-fragger-trapped-behind-enemy-lines.
In the meantime I am modelling the next animal to be added to Survivalcraft in the 1.6 release. This will be a land animal, and it may be dangerous sometimes :-)