In particular, the visit of Perpignan could see the return of former Gloucester Rugby favourites Luke Narraway and Alasdair Strokosch. The two teams last met in the Heineken Cup in 2002-3.
Meanwhile, Munster are, of course, former Heineken Cup champions and played a memorable quarter final here at Kingsholm back in April 2008.
Finally, Edinburgh have a decent European pedigree themselves in recent times, losing 22-19 in the semi finals to Ulster in 2011-12.
Fixture dates and times will be confirmed when possible.
The pools are as follows:
Leinster, Northampton Saints, Ospreys, Castres
Toulon, Cardiff Blues, Glasgow, Exeter
Toulouse, Saracens, Connacht, Zebre
Clermont Auvergne, Harlequins, Scarlets, Racing Metro
Ulster, Leicester Tigers, Montpellier, Treviso
Munster, Perpignan, Edinburgh, Gloucester Rugby