There has been many issues with AT&T and the others providing the connectivity etc. There also has been some much needed TLC being given to sites that have not been getting proper attention in a long time. There also has been a couple of county and municipal level agencies that for one reason or another couldn't make certain deadlines for changes to TG lineups, radio acceptance, and programming etc. Then you have the usual paperwork errors in filings with FCC etc that had to get redone, ad nauseum....
Like I have said when the State is involved, there will be delays, issues, etc....
Again, last I heard was phase 4 flips by end of March, though I myself would bet on May, with the final phase by July/August. I have also heard they are adding Motorola Smart X Bridges for IDOC use until they can convert the IDOC systems to P25.