No, Pat, unless that's a very recent change, it's not that way. The balcony cabins have a sofa that has a pop up SINGLE, length-wise bed in it and then a pull down bed from the ceiling above it.
The minis & balcony cabins are configured this way on all Grand Class ships. Although the Diamond isn't a Grand Class, it's very similar. This could be a change that I don't know about, but I don't think so.
You can call Princess directly to get information from them. Just make sure you get someone who is VERY on-the-ball there, cuz there's a lot of misinformation about the Diamond floating out there. Many of the agents don't know anything about it and quote the wrong balcony sizes too. Make sure they are pulling up the Diamond's deck plans and not the Grand Class ships.
Looks like you'll have a bigger balcony too! We were in E733 and I'll never do it again!