I looked at the article that Bill quoted and I can see why one might jump to the conclusion that 2.5 might be loaded on the EVO out of the gate, but then I read from the pic included in the article (see below.) Before I say what I think, let me just be clear that I am neither a developer nor an expert of any kind. I have worked with and supported developers in the past and I have taken programming classes. I am hoping that someone with real programming/development experience will come forth and chime in. If you are not a programmer please don't attack my post just because you disagree with my interpretation of the evidence.
So I read the text in the code sample that "Type_WIMAX will be included in Froyo SDK." The second line however says, "Until Type_WIMAX is supported you will need to hard-code the value 6." In the article "Froyo" is in a red box.
Here is my logic:
1. "Type_WIMAX" is a programming function or library that allows the developer to write code that can recognize the state of the 4G radio. An example would be the demoed YouTube app that could detect a 4G connection and then automatically change the video quality. I do not believe that if this function is missing that 4G data is not support, it just means developers will not have an easy way to detect the 4G connection state. My conclusion here is that Android 2.1 does support 4G data, just not detection of the 4G connection state. In other words EVO 4G will work fine with 2.1.
2. The second line of the sample code suggests to me that 2.5 will not ship with EVO. The line offers a workaround to developers to identify the 4G connectivity by simply hard-coding the value. My thought here is why create a workaround if EVO will ship with 2.5? The way I read this I would say that 2.1 is again more likely, because 2.5 is not required for the workaround to work with 4G data connection.
3. I think that the writers of the article are trying to create some buzz (which is not bad,) but they are certainly not offering any definitive proof that their opinions are valid. The title of the article is full of