MCPD needs WinForms but no WPF ???

Hmmm... am becoming vaguely interested in getting MS certified, and am currently investigating an MCPD on Visual Studio 2008 (.net 3.5). It looks like you need 3 exams, but I can't for the life of me get my head round why they have retained the winForms component and not replaced it with WPF (70-502).

This from the MS certification website:

Certification	Pre-requisites	Required exams
MCPD: Windows Developer 3.5	MCTS: .NET Framework 3.5, Windows Forms Applications (Exam 70-536 and Exam 70-505)	Exam 70-563: PRO: Designing and Developing Windows Applications Using Microsoft .NET Framework 3.5
MCPD: ASP.NET Developer 3.5	MCTS: .NET Framework 3.5, ASP.NET Applications (Exam 70-536 and Exam 70-562)	Exam 70-564: PRO: Designing and Developing ASP.NET Applications Using Microsoft .NET Framework 3.5
MCPD: Enterprise Application Developer 3.5	MCTS: .NET Framework 3.5, Windows Forms Applications (Exam 70-536 and Exam 70-505) MCTS: .NET Framework 3.5, ASP.NET Applications (Exam 70-536 and Exam 70-562) MCTS: .NET Framework 3.5, ADO.NET Applications (Exam 70-536 and Exam 70-561) MCTS: .NET Framework 3.5, Windows Communication Foundation Applications (Exam 70-536 and Exam 70-503)	Exam 70-565: PRO: Designing and Developing Enterprise Applications Using Microsoft .NET Framework 3.5 (available soon)