It's too early to conclude who will be the champion, especially since it is not yet known how each team in La Liga will perform, and it is even possible that there are teams other than Real Madrid and Barcelona that might make a surprise this season.
Exactly. It is too early to discuss about La Liga winner. Although Real Madrid and Barcelona are 2 strongest candidates, it is surely not impossible for another team to be winner. Atletico Madrid, Athletic Club, or Real Betis is possible to make a surprise. However, I guess Real Madrid and Barcelona are likely to be the winner again.
Real Madrid have certainly looked attractive in the transfer window, and now they have Xabi Alonso to look forward to in the season. However, even so, it still does not guarantee that Real Madrid will simply become champions again, because even though Barcelona didn't bring in many new players, but on the one hand, it made them more solid because their squad didn't undergo many changes, so the chemistry between the players became stronger.
Yep, Real Madrid looks stronger with some new players and the new coach (Xabi Alonso). Sure, there is no guarantee to win the La Liga trophy or Copa Del Rey Trophy. I even assume Xabi and some Real Madrid players are still adapting with their new game style. So, it won't be easy to win all the matches consistently. Even, according to the pre-season matches, Real Madrid defense looked still need some improvement and a better teamwork.