There's still very little known about a handful of fun trailers. Some glimpses of the game's systems have been spotlighted but generally speaking, most of what's been shown off focuses on the world and the cast of eccentric characters.
Speaking on the Xbox Two podcast, Windows Central journalist Jez Corden explained that he's very recently seen alpha footage of Fable 4, noting that the combat system looked very similar to CD Projekt Red's The Witcher 3: The Wild Hunt.
Corden explains that Playground Games employed the combat designer who worked on The Witcher 3, suggesting that the similarities between the games are evident. Perhaps most reassuringly, the journalist also exclaimed that the early build he saw was "fantastic," giving fans hope that Fable 4 might stick the landing.
Fable's Combat Was Never The Best
It Was Okay But Never Great
It makes sense that Fable 4 may be iterating on the combat used for The Witcher 3: The system seen in the original Fable trilogy is also reminiscent of The Wild Hunt. With a combination of melee attacks and magic abilities, the connection is obvious but whether Playground Games can iterate on the established mechanics is what's important. Fable's combat was never the star of the show; While it may have been a decent chunk of the gameplay, the older games are more fondly ed for their stories and world-building.
Fable's combat has always had the problem of being a little too floaty, like players' hits don't have the kind of impact they should. Once some of the game's more powerful spells are introduced, most combat encounters become trivial, turning into a nuisance rather than a challenge. The Witcher 3 has also been criticized for having fairly repetitive combat so one can only hope that Playground can bring out the best of both systems to create something fresh and exciting.

There’s A Good Reason The New Fable Looks So Much Different Than The Originals
Fable has received quite a facelift with its title, but why does it look so different and realistic when the series never did before?
Fable 4 Has A Lot To Prove
Hopefully It Doesn't Disappoint
Fable is undeniably one of Microsoft's most recognizable video game franchises and its prolonged dormancy means there's a great deal riding on the fourth entry. The game has Until more is shown off though, it's difficult to make any bold claims even with the positive reports.
Source: Xbox Two/YouTube