Both wrong.correct ones1.我很高兴你今年夏天会到苏格兰来2.我很高兴你今年夏天会来苏格兰。

1.我很高兴今年夏天你会到苏格兰来2.我很高兴今年夏天你会来苏格兰。

Thank you so much for your explanation! You've been really helpful

I'm really gald you will come to Scotland this summer. 我很高兴你今年夏天会来苏格兰。（一般表示 future tense） “会”here means, 可能，能够 例如，It seems he won't come. 看起来他不会来了。 if he's arrived ,you can say something like,我很高兴你能来苏格兰。Glad you could come to Scotland. hope it can help a little bit.