I think this is likely to be the case, Facebook do have this as an option on their other adverts. I just finished running an advertising campaign on facebook a

I think this is likely to be the case, Facebook do have this as an option on their other adverts. I just finished running an advertising campaign on facebook and was surprised by how the clickthrough rates varied by platform. Mobile CTR was about 15x higher than Desktop, so I'm not surprised they're trying to offer more options.