It is not exactly a new format. The Scottish League Cup started immediately after the Second World War. The initial stages were played in groups up until 1977.
The group stage formation was quite innovative at the time in that it was based around previous league positions, though how rigid that was I'm not too sure. But it gave less successful clubs a real chance to progress.
For example in the 1967-8 competition -
Group 2 consisted of Celtic, Rangers, Aberdeen and Dundee Utd - 4 of the top 5 in the 18 team Division One. They played each other home and away, making 6 games each.
Group 9 was Clydebank, Brechin, Stenhousemuir, Forfar and East Sterlingshire. These were the bottom 5 teams from the 20 team Division Two the previous season. Because it was a bigger group they only played 4 games, 2 home and 2 away.
The group games were completed by 2nd September.
The group winners ( after a preliminary round to reduce 9 teams to 8 ) played quarter finals over 2 legs in mid September.
The semi finals ( 2 legs ) and final were played in October.
I like the bonus point idea for drawn games.
I suppose it is all driven by TV money but it will be interesting to see the attendances.
East Fife were very successful in this competition in the early days. They won it in 1948 ( when they were in Scottish League B - the 3 leagues were A, B, C around then ), 1950 and 1954
PS Just looked at Scottish Division C for 1946-7 and saw it included Dundee Reserves and Dundee Utd Reserves so, again, the Premier 'young' teams playing in lower leagues is not new.