Current status shows nothing happening yet at the "Youth Hill" area of the upcoming theme park. Here's a description of that area:
Also known as Hill of Youth, this section is based partially on Howl’s Moving Castle. Located at the park’s north entrance, you’ll find a yellow gate and an observation tower, complete with nineteenth-century objects from Howl’s Moving Castle. This section also features European-style brick buildings and buildings reminiscent of the Seiseki-Sakuragoaka Tokyo neighborhood antique shop from Whisper of the Heart.
Sources: https://www.instagram.com/p/B_ryx9zJ8dI/ and https://www.jrailpass.com/blog/studio-ghibli-theme-park#Youth_Hill