The 1st draft of the revised Gathering of Hosts has now been uploaded to Google docs.
In brief, having decided to drop WHAB, a decision to reverse the slow process of converting to single figures and movement trays was not long in following. Despite having various Old School leanings, and despite the potential flexibility, the awkwardness of the single figures and the rules advantages of basing the rules on elements have swung me back to how I have tended to approach ancients for 25 years, with a few twists.
I have not pursued the grid option but the changes were strongly influenced by Bob Cordery's work with chessboard wargames. Essentially, the rules are now close to being an ancients version of the phantasm called the Square Brigadier (which rapidly turned into the latest version of Hearts of Tin). The troops types are those already laid out in Gathering of Hosts, with the orders dice system, initially inspired from DBA though somewhat different in application and a simple hit system inspired by Morschauser, with my own twist on it all.
I am now chomping at the bit to get the Persians on the table. I want to start with something different but a refight of a Greek& Persian wars battle will have to follow soon as a benchmark test.