What is the recommended approach for building line of business apps for Windows 8? e.g. complex bespoke finance application
They clearly don\'t fit into the Metro style
It's really early to have a good answer to that question. WPF apps will not go away and I think it will go on. What specifically will change is open. Some things might be said in one of the talks and others will show later in the process of Windows 8 and later. Personally I think there is no immediate need to change your current strategy on LOB. If it is WPF use that, if it is WinForms or WebForms it is good as well. Maybe an approach to have a special tile that sums up some key data and calls the app will put additional value.
This is just an opinion