We don’t have any information on that yet and CSS transformations are not even on the roadmap.
You could render your text as a SVG and use SVG-transformations to rotate it. Not really a great solution in terms of keeping the text editable, but if you really need rotation I think that’s the only way right now.
I also posted about this a while ago, but no reaction, so I’m not holding my breath. Although this literally blocks adding a feature to my plugin. Currently there’s no way to display text vertically in any way I know of
Theoretically it’s possible to create a text layer in Photoshop (with the desired font options), create a work path from it, convert the path to SVG, add the rotation and finally render it on the panel Not really the most fun workaround I guess