[quote="TheLionPrince"]This is surprising news! But hold on just a second, if Jason Marsden is reprising Kovu, then that means Kovu has hit puberty already. Given Kiara is still a cub (albeit older since her interaction with Kovu), you would think Kovu still is one, too. Or will we see an adolescent Kovu similar to how adolescent Simba looked in
1½ (almost full-grown body but still noticeable cub facial features, but has his adult voice)?
It's a shame Jennifer Lien has retired, and ran into trouble with the law a few months ago, but Lacey Chabert is a good choice given she voiced cub Vitani. But who knows as of now, maybe Vitani is still a cub in this series.[/quote]
Kovu should be a good ways into his teens. Hair tufts are a good, but subtle, measure of age. Kovu already had a hair tuft when he met Kiara in SP. TLG Kiara is significantly older than SP cub Kiara, and Kovu has a year or so on her.
SP cub Kiara seemed to be going out to play on her own for the first time, or the second or third time at the most. That would put her at roughly 5-6 years old. This is even exemplified by the almost baby-ish way she's drawn in a couple shots:

Meanwhile, in TLG, she's Kion's
older sister. Kion already has a sizable hair tuft, so he's probably around 10-12, with Kiara in the range of 12-14. TLG Kovu, then, should be 15-16. These age estimates are of course based on how humans age. Vitani should also be a teen, and while cub Vitani's voice is pretty fitting for a teen as well, I'm sure Lacey can add a little bit of an older edge to it.