I love Siemens!
This is great news. Big companies are finally realizing what can be done with the Blockchain.
Are you sure it is that positive?
It is not investing in BITCOIN, it is investing in blockchain tech and they will most likely will explore idea of creating private and independent blockchain suited for their needs.
They won't add any value to bitcoin's blockchain at all, so we as bitcoin users won't profit from their research at all.
It is good news from researchers point of view, but from standpoint of bitcoin community not so much.