What does Psion want?
The document goes on to say Psion is not seeking financial compensation. However, in the court document, filed a mere four days after the amendment was made, Psion includes the following among its desired outcome from its case against Intel:
That Psion recover all damages it has sustained as a result of Intel's infringement, unfair competition, unfair trade practices and unjust enrichment;
That said damages awarded to Psion be trebled pursuant to 15 U.S.C. § 1117(a);
That an accounting be directed to determine Intel's profits resulting from its infringement, unfair competition and unfair trade practices, and that such profits be paid over to Psion, increased as the Court finds to be just and proper under the circumstances of this case;
So while Psion seems to have some grounds for insisting NETBOOK is still an active trademark belonging to it, it's not clear precisely what Psion expects to get out of this case. Additionally, you might have expected Psion to keep making new products using this brand if it was so important, which it hasn't.
As ever, for the time being the only people who look likely to profit from this action are the lawyers.