From all the reports we've read the bout will take place in April. The possible dates are April 11th or the following Saturday, April 18th. The venue will depend on which of the dates the bouts end. up If the bout calls on the 11th then it will take place in New York whilst the bout would go to Las Vegas if it's arranged for the 18th.
At the moment the other details, such as the under-card or TV network, are unknown though it has been hinted that all 3 Kameda's, Tomoki, Koki and Daiki, could be on the card which would be managed by American advisor Al Haymon. It's also thought that the winner would be the recipient of the WBA "unified" title, not to be confused with the WBA "Super" title held by Juan Carlos Payano.
For Kameda this will be his 3rd bout in the US following two previous title defenses Stateside. The first of those, his US debut, saw him blowing away Pungluang Sor Singyu with a vicious body shot whilst the second was an unconvincing decision win over Alejandro Hernandez, though it was wider than the cards suggested. For McDonnell this will be his US debut and his first fight outside of the US since he upset Jerome Arnould in France for the European Bantamweight title way back in 2010. Interestingly it would be McDonnell's second bout against an Asian opponent, following his win over Thailand's Tabtimdaeng Na Rachawat last year.