Long time lurker, but thought I'd hop in with some information for those that monitor things around the Des Moines Metro area.
1) LINC is being phased out and will be replaced with the Metro Interop Communication System. Kevin Sanders has the write up about it here: Des Moines Metro Interoperability Communications System (MICS) plan
2) Polk County Fire Departments are being switched to the Racom Edacs system. The dates keep getting pushed back, but as of right now the switch looks to happen about Mid-February. I'll post more info as it becomes available. There will still be a vhf paging channel, but all response traffic, etc will be on Edacs.
3) Norwalk (NW Warren Co) is now being dispatched by Westcom. Again I don't have any ID info, but if I find it, I'll post it. This covers both the FD and PD.