Well, you know how it is...
The "we want to do our part for international security too"-attitude is all over Berlin, so to say.
If they would have the money, they might even build their own carrier now. Just joining in on the british-french thing like this would at least be a much cheaper alternative.
And the idea sounds like something the french would like too. After all they would have the same capabilities but pay less for it if some of the aircraft would be german.
And that is why i think it's stupid. What is the point of having a naval airforce when it can only go and do to where and what the french send their carrier.
Since the french will buy new carriers anyway and most likely use them only with a european backed UN mandate, installing a german naval airforce there would only mean to fund and to subsidize the french navy and not to enhance the german defence capabilities, since this aircraft could only go where the french send the carrier and only do what normally french aircraft would have done.
It would be much better to use that money for buying more F124 frigates and Type 212 submarines that could contribute to a naval european defence force by escorting the french carriers if neccessary and still be of use without those carriers.
Or we just could skip the era of aircraft carriers and build our own arsenal ship. That can't be too complicated and expensive. All you need is a cruiser sized ship with a lot of vertical launching tubes for cruise missiles and stuff like this.
Hell, just take the trunk of a container ship, ad some military improvements to it, put the radar and self defence systems of a modern anti-air frigate like the F124 on top and use the rest of the free space for vertical launching tubes. Then give it some stealth-coating and viola, you got your big and powerful arsenal ship that could match the offensive capabilities of a big aircraft carrier. After all it's the whole aircraft-infrastructure that makes them so expensive and complicated. The arsenal ship is a good idea because with sophisticated guiding systems for your cruise missiles, you can just cut the mediator and let the bombs fly directly from the ship to the target without having them put beneath the wings of an aircraft first.
However, buying Rafale or JSF and renting space for them on a foreign carrier would be really stupid.
But let's not freak out as long as there are no real news and details about this rumor.