Hopefully in the next update which could be released in the next couple of weeks. Be aware that the support will only be for the latest Photoshop or Photoshop Elements or for the latest version of Lightroom. There will be no updates to older versions that will provide that support..
will ACR 9.8 work in LR5.7 or 6 standalone?
Lightroom does not use the Adobe Camera Raw plugin. That's used by Photoshop and Bridge.
Lightroom 6 users should update to Lightroom 6.8 which includes the new camera updates.
There are no updates for Lightroom 5.7 or earlier. People with those versions will need to either pay to upgrade to Lightroom 6.x or use the free Adobe DNG converter then edit the DNGs in their version of Lightroom.
Camera raw 9.8 download crashes all the time. I´ve trying for 2 days and I´m not the only one
We are aware of the recent download issues with the ACR installers and are working on a resolution. Thanks for your patience.