John's side will be looking to improve on their Plate semi-final finish at the Delhi 2010 Games in Glasgow after a 2013 season which saw them reach the quarter-finals in Moscow at the Rugby Sevens World Cup and reaching the final of the Hong Kong leg of the series.
John said: "It's always an honour to represent your country at the Commonwealth Games. We're really looking forward to the challenge that awaits us in Glasgow.
"It is going to be an extremely tough and competitive tournament as all the leading teams that compete in the World Series happen to be in the Commonwealth.
"Any Sevens competition which has nations like New Zealand, Samoa and South Africa taking part is going to be a tough proposition but we will be determined to do better than four years ago in India where we were knocked out at the quarter-final stage by New Zealand."
On the news that Wales will be sending all four teams to compete in Glasgow, Chris Jenkins, Chief Executive of CGCW, said: "We're absolutely delighted to learn that we will have a team representing us in all four of the team sport competitions.
"It'll be the first time we've done so for the last few Games and it just goes to show the standard of Welsh sport we're currently enjoying.
"Both the netball and women's hockey teams have brought gold medals back to Wales this year and we'll be backing them all the way to make the podium in Glasgow.
"The team size will now be significantly increased with four teams making up the numbers and we'll no doubt be sending one of our biggest ever teams to a Commonwealth Games."