Vertaling van "unawares by future developments and the legal consequences were once again settled " (Engels → Frans) :

It would be regrettable if the EU legislator were to be caught unawares by future developments and the legal consequences were once again settled by the Court of Justice.
Il serait en tout état de cause dommageable que l'évolution future des pratiques prenne de court le législateur communautaire et que les conséquences juridiques soient une nouvelle fois décidées par le juge.