According to Chris Holmes, Philthy had a brain aneurysm last year and nearly died. He says that Philthy has been unable to continue work on their new album because the brain aneurysm "fucked up" his memory. Chris also says that Philthy recently was on holiday in Portugal and got kidney stones. Apparently, the album will still be released this fall.
Here's the interview: http://blabbermouth.net/news.aspx?mode=Article&newsitemID=180180
I fear that we will not hear anymore music from Philthy, but I hope I'm wrong.
Get well soon, Philthy!