Rio Dyer, Joe Goodchild and George Gasson are all set to feature in the latest leg of the tournament.
Wales Under-20s player Dyer joins Tom Rogers (Scarlets) and Reuben Morgan-Williams (Ospreys) in preparing to make his sevens debut at FMG Stadium Waikato on 25 January.
The Sydney Sevens will take place a week later on 2 February.
Coach Richie Pugh said: "Starting with a larger player base this season than we've had in the past has allowed us to prepare well for the forthcoming tournaments.
"Rio and Tom are coming in on the back of injuries, and both have pace and attributes that are well suited to the sevens game. Reuben, who's had quite a lot of regional experience, is rewarded for his form in training.
"The experience and physical presence of Sion Bennett is huge for this group. He last played four years ago, and in the time since he's been with Northampton Saints and Cardiff Blues.
"It's also good to bring back Mike Wilson from Aberavon, who experienced two World Series tournaments last year.
"He's an athlete who still trains as a sprinter, so I'm looking forward to seeing that x-factor he can bring."
Congratulations to all three players from everyone at Dragons.
Wales Sevens: Joe Jenkins, Owen Jenkins, Ben Roach, Luke Treharne (Capt), Dane Blacker, Sion Bennett, Dafydd Smith, Rio Dyer, George Gasson, Joe Goodchild, Reuben Morgan-Williams, Tom Rogers Aberavon: Mike Wilson.
