As you have said they is still a rumour, although I can speculate that they have been in the bitcoin bandwagon years ago.
In any case, I would say this is a welcoming and positive news as bitcoin may reach new heights is this rumour is true specially with that huge amount involved. So let's see how it pan out in the next couple of months. Elon Musk has open the pandoras box.
Counterpoint Global, a unit of Morgan Stanley Investment Management that’s racked up wins in mutual-fund rankings, is exploring whether the cryptocurrency would be a suitable option for its investors, according to people with knowledge of the matter. Moving ahead with investments would require approval by the firm and regulators.