If you look carefully at the Portal 2 end credits (found here, spoiler warning), you'll see the following numbers at the top of the screen:
2.67 1002 45.6
Is there meaning behind these numbers, or are they just random?
Go ahead and check the location; but perhaps, there might be more meaning to these coordinates.
Thinking about the connection between the song and that location, it does refer to the location where that she gets back in control of the Aperture Science Enrichment Center...
In the external thread that I linked as a comment to your answer, they seem to have discovered that he scrolling text might resemble to
Perhaps a way of GLaDOS to say we have to get to sleep and wait for a sequel in the future?
The ovaltine thing on facepunch is a joke related to a penny-arcade strip from a few months ago. I think the coordinates thing is a good lead, but we haven't been able to solve the mystery of the scrolling bit.