Jan Seifert had an interesting post on his blog a few days ago which more or less predicted that the pipeline would not be built as there would not be enough gas and political relations with Poland were improving.

The article is in German, but cited a CEPS briefing by Alan Riley (here), an IEA book (here) and a 2006 study by Milov, Coburn and Danchenko (here).

I wondered what your take on that would be.