Management is a little bit concerned, per Lebrun, that an early move will disrupt the tandem chemistry, since both Caps goalies are UFAs and technically are platooning. They would probably go pretty big and pretty long where Thompson's next contract is concerned, but are not likely to give much of a raise to Lindgren, if at all.
That seems to be why nothing has happened yet. He's happy and they are happy and that probably means a deal gets worked out, but the resulting impact on Lindgren might be delaying movement from the team. As they end the platooning situation and migrate shortly to more Starter-Backup roles, maybe that's the trigger for talks.
Goalies are unpredictable but management is very impressed (not unlike how they felt about Lindgren last season, and he turned back into a pumpkin this year. I'm sure that gives them pause with respect to doling out a big contract to Thompson).