I do note that the latest WT has an article on singing which is pretty much the same content as every other time that they have trotted it out.
It makes no mention of clapping but does mention that the use of screens enables the song to be sung out.
For the time being at least clapping in time to the songs does not seem to be something that the GB wish to encourage at congregational level.
Perhaps some of us who still have to attend should try it and see if it catches on...