I am not convinced that this is anything more than an investment by LH where they see a potential profit with little downside, the Dollar is weak and the Euro is strong at the moment.
As JetBlue stands it is not up to the level of a carrier that LH would want to work with. They do not offer FC/BC nor do they have an elite program or any way for that matter to recognize elites from other airlines. JetBlue does not even interline with any major US or foreign carrier, unless things change dramatically, I really do not see this as more than a potential gamble by LH.
Dan