"I'll save that for the next time we meet in person."
"You'll just have to look forward to that the next time we meet in person."
"I'll save that for the next time we meet in person."
"I'll save that for ~" 「それは〜に置いときます」・「〜お楽しみしておきたいな」
"the next time" 「次」
"we meet in person" 「直接会う」
"the next time we meet in person" 「次直接会った時」
"You'll just have to look forward to that the next time we meet in person."
"you'll just have to look forward to ~" 「君は〜お楽しみしてね」
"to that" 「それは」