Huge deal is perhaps overstatement. Already many cameras record ProRes and DNx as well as RAW formats. cDNG is already a well established open codec with up to 4:1 compression so this new ProRes format is only slightly more compressed. That’s not a huge deal and unless Apple make it an open codec then that slight advantage is not going to pay off. In other words unless cross platform NLE software gets to use this without problems, as more and more post finishing facilities are going to Win & Linux, then using it in the field will be discouraged from the finish facilities and for good reason.
DSLRs with ProResRAW? I think not. Their onboard cards are not up to the rigors of this sort of data rate. There’s a reason why non DSLR cameras go for CFAST and SSDs. To get from H264 at data rates under 50Mb/s to ProResRAW around 200Mb/s is not insignificant. If they can handle ProResRAW then they can probably already do cDNG. They don’t because real big fast dual card DSLRs are not normal. Chuck in the need to get up to 60p and no, ProResRAW isn’t any new big deal in that area. DNG might come up with a 6:1 codec which would be a bigger deal potentially.
The article seems to not be aware that ProRes has in fact been losing ground as a deliverable format but if you stay inside the FCPX bubble you wouldn’t notice. More common now are the XAVC codecs for broadcast deliverables. Smaller than ProRes and can be easily made on cross platform software. As long as Apple hog ProRes as a recordable format within their ecosystems the more likely it is that their proprietary format will not be a big deal let alone a huge one. Given the similarities between DNx and ProRes and how DNx codecs exist that match the ProRes family, I wouldn’t be surprised to see DNxRAW appear before too long. That would also be big, probably bigger.