Now, it's not possible to use SDK to export a particular Microflow, Page to mpk packages.
There are cases that we have bugs on a microflow which already commited to teamserver, and want to revert to an older version. Now we have to create a branch on the revision has correct version and then can export, then import again to overwrite (correct me if you have other easier ways)
If we can do that by SDK- export microflow of a revision to mpk package, that will be very nice.
I'm not sure what you mean by SDK.
From the modeler this is no problem (though you will get a bit more). Right click on the microflow and choose 'export to file'. This will create an .mpk file.