Answer no but the whole thing needs sorting out in a court of international law once and for all so yes it should go to trial.
Why, the whole issue couldn't be clearer from a legal point of view? There is nothing to clarify here, Germany has no legal obligation to pay any further reparations to Poland. If this goes to a court, the inevitable ruling against Poland would only be used by JK to claim that there is a conspiracy against Poland.
This old argument has been boiling for ages take a look at this interesting article from 2004.
There is another article that deals with the aftermath of the Sejm's declaration:
, Jochen Frowein, [...] along with a Polish historian, came to the conclusion that no such demand by Poland had any chance of being upheld in a court of law - and that remains the case today.
Within a historical context, the Polish demands of the German government are more than justified.
I am not disputing this. Germany has brought terrible suffering among Poland, but it is also worth mentioning that as an reaction Germany has tried to be as accomodating to Poland as possible during the last few decades. It was Germany who e.g. insisted that Poland could join the EU as soon as possible, with Poland receiving a lot of money via the structural funds over the years. Germany and Poland have reconciled and have signed treaties that solved the issue legally and politically. It is time to leave the past behind and not open this issue again that will only serve to poison German-Polish relations without any benefit to either side, since Poland will definitely get no further reparations from Germany and it will only add validty to the claims of the Germans expelled from Poland.
Personally I would not object e.g. if as an reaction Germany would be creating a new fund that e.g. allows young people from both countries to visit each other, to get a better understanding. But it is just ridiculous to expect that Germans could be guilt-tripped to pay e.g. 100bn€ for the crimes of (in my case) great-grandfathers when the issue has long been solved.