Very interesting, I did a google search and saw an article discussing what you're talking about. I'm not sure that instills much confidence for me in regards to resolving anything in regards to multiverse theories. I knew that the space in our solar system beyond our current known planets was really vast, but the notion that there could be another official planet out there is pretty shocking to me.
and it may be a very large planet....well, you know...multi planets...multi universes...it all ties in.......
Perhaps these planets are crossing inter dimensional planes; which is why we can detect them but not actually 'see' them