Paul Smaczny, producer of the Abbado Lucerne concerts, left Euroarts at the beginning of 2010 to found its own label Accentus. He has taken the rights for the subsequent Lucerne productions with himself, that means Euroarts wasn't and won't be able to formally complete the planned full cycle and had to stop with the 2009 recordings (Mahler 1st and 4th). That's why they released Symphonies 1-7 as a box, they won't release the remaining ones. They may release the Berlin Lied von der Erde, as Accentus hinted me they own the rights there. The Ninth was released under the Accentus label, and the same will most probably happen for the upcoming Abbado Lucerne 2011 concerts (where the Adagio from the 10th will be performed again).
The 8th is planned for 2012, it's stated in the main Lucerne 2011 program. This wasn't supposed to happen but someone must have changed his mind in this respect.
Forget about a performing version of the 10th from him, he doesn't believe in these...