I've just checked and can confirm that the Global Pension Plan site is now back and working fully. There is a short message in the forum area just acknowledging that they are back but apart from that no further news.

It's still unclear what work is going on in the background as it appears (and I didn't test this fully) that it is still possible to invest.

At least the site coming back is a positive sign as I think if mal intent was involved they would not have bothered (I could be wrong of course).

Personally I'm maintaining my patience and waiting for a formal update. I've come to the conclusion that the best one can do in these situations is to get on with things and not fret about these investments on a daily basis. Let's hope Global Pension Plan have some good news in the near future as for many people not knowing can be painful.