We will continually update this post with all the most important infos about the new cameras. The link list has a cronological order (latest added on top).
UPDATE 2: Many many many thanks for sending me all this links :)
UPDATE: Reload the page to see the updates!

Live tweet of the Panasonic UK event: http://twitter.com/joshwal (press conference at 9am London time)

Press release:
Panasonic G2 and G10 presentation on Amazon
Panasonic global press release: http://panasonic.net/avc/lumix/popup/pressrelease/g2g10.html#1
The official Panasonic press release (Panasonic UK)
The PhoBlographer
Forum Four Thirds (german)
Focus Numerique knows the price! 599 Euro for the G2(body only) 699 Euro with lens and 549 Euro for the G10+Lens! Crazy only 150 Euro difference?
Photoscala (german)
Dpreview: 14-42mm lens / G2 / G10
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Hands-On:
Hands-on on dkamera.de (german)
Imaging Resurce: “The Panasonic DMC-G2 retains its predecessor’s 12.1 effectieve megapixel sensor resolution, and yields a maximum resolution of 4,000 x 3,000 pixels. Compared to the G1 though, the Lumix G2 uses a newer generation of the company’s image processor, dubbed Venus Engine HD II.”
Panasonic G2 by dpreview
Photographyblog Hands-on G2 / G10 / Panasonic G2, G10, G1 Comparison
hardwarezone “Panasonic explained to us that the G and GH product lines are going to be developed separately. The GH series will be the premium, Full HD capable line, while the G series will be more photo than video-centric, explaining the 720p video recording limit on the G2 and G10.”

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Videos:
Panasonic UK video: http://www.youtube.com/watch?v=01q7gr2_TQQ
Two more youtube videos here -> http://luc.saint-elie.com/
First touchscreen test http://vimeo.com/9936494

UPDATE: According to a Korean website the G2 and G10 will be released in June. Our sources told us it will probably be a little bit earlier (late May)