Missing PDF Format for Some Wrox Titles

Wrox (The Publisher) Provides their ebooks in PDF, Mobi, EPub formats.
O'Reilly carries WROX books, but some titles only show Mobi & EPub.
I want PDF format for:
1) Professional C# 4.0 and .NET 4
2) Professional Visual Studio 2010
Will the above titles eventually come in PDF format? If yes, when?
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