Moving up to 2.0

right now I’m walking myself through senocular’s OOP in flash tutorial. I use regular MX, and thus, actionscript 1.0. My question: should I follow through with this tutorial? I plan on upgrading flash when mx05 comes. So then will it be confusing to change everything I know over to AS 2.0? does 2.0 just have added features, or does it change everything around?