France will elect its new President. Segolene or Sarkozy, or maybe even Bayrou will change the scene of French politics, or at least they will refresh it given that Chirac has monopolized it in the last 12 years.
Very soon, Scotland will also vote for its 'local' elections, perhaps the last. If the SNP (scottish nationalist) wins, then those elections will probably be national in the future. For an European living in Scotland this alone may be a good argument against SNP: why would we vote to lose our vote?
Gordon Brown will look at this election with great interest. If the SNP wins and Scotland goes toward independence, then its chances of becoming a strong prime minister collapse: he could not claim anymore to represent british interests. In any event, UK constitutional politics seemed geared toward a time of change!
All this may contribute to a renewal at the European Constitutional level. France may well have a new referendum on a simplified text, probably a simple Treaty. The UK will have to redesign its European politics. If England remains Euro-Skeptic, Scotland is in general quite Euro-friendly.