Topalov ventured against Kamsky the obscure Romanishin line with 7.Bf4 against the Grunfeld in their Candidates game today. I have mentioned this very same (rare) variation at this blog! Topalov deviated from Schiller's recommendation (feels surreal to type that, yes) by going 8.Qa3 instead of 8.Qc2. (See Schiller's e-book at the top of page 3.) Of course, Topalov's further experiment of 0-0-0 and h2-h4 amounted to either wishful thinking or disrespect against a lionhearted defender like Kamsky.
Also see GM Henrik Danielsen's video analysis of the game at chessdom.com