So you got what the Japanese style toilets are, and used to be, like, eh? What makes you confused about toilets once in Japan may not be limited to squat ones, though. Even Western style toilets could give you pause for thought -- high-tech toilets.
It was in 1980's that TOTO, a Japanese sanitary ware company, announced its new product named "Washlet" with the impressive catchphrase "Even your bottom wants to be washed." To be honest, I didn't imagine them to be as popular as they are now. I don't know what percentage of Japanese homes equip them, but you can easily find them in, say, urban hotels. Beside the toilet seat is a control panel with many buttons on it, and because they are usually written in Japanese, you could enjoy the thrill of pushing the buttons at random. Be careful not to leave the seat once you push a button, or ....
A lot of restrooms in department stores or restaurants provide both Japanese and Western style toilets. You can choose between them. I would choose a Japanese one. I'm perfectly used to Japanese styles, of course, and I don't want to sit, if possible, on the same toilet seat that some strange guy has just used. Neither, it seems, do many people. Some toilets equip automatically-rotating seat covers. I was amazed (and amused) to see it first, but, yeah, I like them.
My wife told me that some toilets in public washrooms have censors that will make flushing or river-like sounds to cover up the noise while you are doing your business. Aha! I don't want to see them at men's rooms, though.
Generally, Japanese are known to be cleanliness conscious. I think it's true, provided it's specifically for oneself, and that makes the high-tech toilets popular here. But you may be disappointed with the mess in public washrooms.